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x=0
b)4x+7:x+1=x+3
4x+7:x+1=x+3
4x=3-7-1
4x=-6|:4
x=-1,5
c)x-3:2x=x-2:2x+1
x-3:2x=x-2:2x+1
2x=3-2+1
2x=2|:2
x=1
d)3x+5:2x+3-x+2:2x-3+3:2
3x+5:2x+3-x+2:2x-3+3:2
2x=-5-3-3+3+3:2
2x=5,5|:2
x=2,75